Searching for bike transmission

Discussion in 'General Questions' started by Bosseffe, Oct 12, 2015.

  1. Bosseffe

    Bosseffe New Member

    Hello all I'm new to the forums and was wondering if someone could answer my question. I am building a bike with a 7hp Briggs and Stratton and was wondering if the standard pocket bike transmissions would be able to hold up to the strain of this motor. If not does anyone have any suggestions on what I could use?

  2. jaguar

    jaguar Well-Known Member

    7hp is hardly enough to make a big strain
  3. Bosseffe

    Bosseffe New Member

    Ok thanks!
  4. The_Aleman

    The_Aleman Active Member

    You're pretty much limited to a belt-and-pulley reduction or chain-and-sprocket like go-karts. Every Briggs bike I've seen on here over the years used belt-and-pulley.

    You'll likely want to aim for a reduction of between 9 to 12:1 (engine to wheel). 9:1 will get you 30MPH @ 3600RPM (26" wheel), 12:1 is ~24MPH @ 3600.